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EP1265062A2 - Appareil et procédé de mesure de la dispersion chromatique de fibres optiques - Google Patents

Appareil et procédé de mesure de la dispersion chromatique de fibres optiques Download PDF

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Publication number
EP1265062A2
EP1265062A2 EP02012377A EP02012377A EP1265062A2 EP 1265062 A2 EP1265062 A2 EP 1265062A2 EP 02012377 A EP02012377 A EP 02012377A EP 02012377 A EP02012377 A EP 02012377A EP 1265062 A2 EP1265062 A2 EP 1265062A2
Authority
EP
European Patent Office
Prior art keywords
optical fiber
chromatic
optical signals
optical
dispersion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP02012377A
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German (de)
English (en)
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EP1265062A3 (fr
EP1265062B1 (fr
Inventor
Eisuke c/o Sumitomo Electric Ind. Ltd. Sasaoka
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Sumitomo Electric Industries Ltd
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Sumitomo Electric Industries Ltd
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Publication date
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Publication of EP1265062A2 publication Critical patent/EP1265062A2/fr
Publication of EP1265062A3 publication Critical patent/EP1265062A3/fr
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Publication of EP1265062B1 publication Critical patent/EP1265062B1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/35—Testing of optical devices, constituted by fibre optics or optical waveguides in which light is transversely coupled into or out of the fibre or waveguide, e.g. using integrating spheres
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
    • G01M11/333—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face using modulated input signals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
    • G01M11/335—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face using two or more input wavelengths
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
    • G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
    • G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
    • G01M11/338—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face by measuring dispersion other than PMD, e.g. chromatic dispersion

Definitions

  • the present invention relates to an apparatus and method for measuring chromatic dispersion in an optical fiber.
  • Single-mode optical fibers in which chromatic dispersion is zero around the wavelength of 1.3 ⁇ m and is approximately 17 ps/nm/km around the wavelength of 1.55 ⁇ m, dispersion-compensating optical fibers in which chromatic dispersion is negative around the wavelength of 1.55 ⁇ m, and dispersion-shifted optical fibers in which the zero dispersion wavelength is shifted from the wavelength of 1.3 ⁇ m toward the longer wavelength side have been used thus far as optical fiber transmission media in optical communication systems.
  • a dispersion-managed optical fiber is also under consideration in which chromatic dispersion varies, having an opposite sign alternately in the longitudinal direction at the wavelength of 1.55.
  • Known methods for measuring chromatic dispersion in an optical fiber are a pulse delay method, a phase shift method, and an interferometric method (Giovanni Cancellieri, Single-Mode Optical Fiber Measurement: Characterization and Sensing (Artech House, Boston, 1993), chap 3, pp. 139-144).
  • chromatic dispersion in an optical fiber can be measured by in-line measurement during a manufacturing process in which the optical fiber is drawn from an optical fiber preform, it is possible to make the optical fiber to have a designed chromatic dispersion by controlling the drawing conditions (for example, the drawing speed, the optical-fiber-preform feeding speed, and the drawing-furnace temperature) on the basis of the result of such measurement.
  • drawing conditions for example, the drawing speed, the optical-fiber-preform feeding speed, and the drawing-furnace temperature
  • an optical fiber having a length of 0.5 km or more is necessary for measurement.
  • the phase shift method it is necessary to measure the amount of phase shift of each of the optical signals having different wavelengths that are made to enter an optical fiber to be measured, and this increases the measurement time.
  • the interferometric method it is necessary to measure interference signals while adjusting the difference in optical path length between two optical paths in an interferometer, and thus the measurement consumes considerable time. For this reason, it is difficult to perform in-line measurement using the above methods.
  • a chromatic-dispersion measuring apparatus including a light source unit for outputting intensity-modulated optical signals having a plurality of different wavelengths and for causing the optical signals to simultaneously enter an optical fiber to be measured, a de-multiplexer for de-multiplexing the optical signals output from the optical fiber, a photodetector for receiving the optical signals de-multiplexed by the de-multiplexer, a phase detector for detecting the phase difference between the received optical signals, and an arithmetical circuitry for calculating chromatic dispersion in the optical fiber on the basis of the phase difference.
  • a chromatic-dispersion measuring method including the steps of causing intensity-modulated optical signals having a plurality of different wavelengths to simultaneously enter an optical fiber to be measured, de-multiplexing the optical signals output from the optical fiber, receiving the optical signals, detecting the phase difference between the optical signals, and measuring chromatic dispersion in the optical fiber on the basis of the detection result.
  • optical signals may be caused to enter an optical fiber to be measured from an upper end of an optical fiber preform and to pass through the optical fiber preform while the optical fiber is being drawn from the optical fiber preform, or may be caused to enter the optical fiber from the side face of the optical fiber.
  • the optical signals emerging from the side face of the optical fiber may be received after being de-multiplexed.
  • Figure 1 is a schematic diagram showing a structure of a chromatic-dispersion measuring apparatus 1 of the first embodiment.
  • the chromatic-dispersion measuring apparatus 1 comprises a light source unit 100 and a phase detector unit 200, and serves to measure the chromatic dispersion of an optical fiber 9.
  • the light source unit 100 includes light sources 111 and 112, a multiplexer 120, and an intensity modulator 130.
  • the light sources 111 and 112 output continuous light beams having different wavelengths ⁇ 1 and ⁇ 2 , respectively.
  • the wavelengths ⁇ 1 and ⁇ 2 serve as measuring wavelengths, for example, around 1.55 ⁇ m, for measuring the chromatic dispersion of the optical fiber 9.
  • the multiplexer 120 multiplexes the two light beams, and outputs the multiplexed light beams to the intensity modulator 130.
  • the intensity modulator 130 subjects both multiplexed light beams having the wavelengths ⁇ 1 and ⁇ 2 to intensity modulation with a predetermined period, and outputs the light beams as optical signals.
  • the optical signals that are output from the intensity modulator 130 enter simultaneously the optical fiber 9 to be measured.
  • the phase detector unit 200 includes a de-multiplexer 210, photodetectors 221 and 222, a phase detector 240, and an arithmetical circuitry 250.
  • the de-multiplexer 210 receives and de-multiplexes the optical signals having the wavelengths ⁇ 1 and ⁇ 2 emerging from the optical fiber 9, outputs the optical signal with the wavelength ⁇ 1 to the photodetector 221, and outputs the optical signal with the wavelength ⁇ 2 to the photodetector 222.
  • the photodetectors 221 and 222 receive the optical signals having the wavelengths ⁇ 1 and ⁇ 2 , respectively, and output electrical signals in accordance with the intensities of the optical signals.
  • the phase detector 240 detects a phase difference between the electrical signals output from the photodetectors 221 and 222, and thereby detects a phase difference ⁇ between the optical signals having the wavelengths ⁇ 1 and ⁇ 2 .
  • the arithmetical circuitry 250 calculates the chromatic dispersion D of the optical fiber 9 on the basis of the phase difference ⁇ , the difference ⁇ between the wavelengths ⁇ 1 and ⁇ 2 , the period T of intensity modulation, and the length L of the optical fiber 9.
  • the chromatic-dispersion measuring method is adopted to measure the chromatic dispersion of the optical fiber 9 using the chromatic-dispersion measuring apparatus.
  • the chromatic-dispersion measuring method is adopted to measure the chromatic dispersion of the optical fiber 9 using the chromatic-dispersion measuring apparatus.
  • the light source unit 100 continuous light beams having the wavelengths ⁇ 1 and ⁇ 2 output from the light sources 111 and 112 are multiplexed by the multiplexer 120, are subjected to intensity modulation with a predetermined period by the intensity modulator 130, and are then output as optical signals to the optical fiber 9 to be measured.
  • the optical signals having the wavelengths ⁇ 1 and ⁇ 2 output from the light source unit 100 propagate through the optical fiber 9, and enter the phase detector unit 200.
  • the optical signals having the wavelengths ⁇ 1 and ⁇ 2 output from the optical fiber 9 are de-multiplexed by the de-multiplexer 210. Subsequently, the optical signal with the wavelength ⁇ 1 is received by the photodetector 221, and the optical signal with the wavelength ⁇ 2 is received by the photodetector 222. The phase difference between the optical signals having the wavelengths ⁇ 1 and ⁇ 2 is detected by the phase detector 240. The chromatic dispersion of the optical fiber 9 between the optical-signal incident position and the optical-signal emergent position is calculated by the arithmetical circuitry 250 on the basis of the detected phase difference.
  • the configuration of the light source unit 100 is simple in this embodiment. Moreover, since the chromatic dispersion of the optical fiber 9 is measured on the basis of the phase difference between the optical signals having the wavelengths ⁇ 1 and ⁇ 2 after the optical signals propagate through the optical fiber 9, it can be quickly measured even when the optical fiber 9 is short.
  • an optical fiber 9 obtained by drawing an optical fiber preform 8 is wound around a bobbin 930 via a roller 920.
  • the drawing conditions for example, the drawing speed, the optical-fiber-preform feeding speed, and the drawing-furnace temperature
  • a control unit 940 controls the drawing speed, the optical-fiber-preform feeding speed, and the drawing-furnace temperature.
  • Optical signals having the wavelengths ⁇ 1 and ⁇ 2 are output from the light source unit 100 after being intensity-modulated, enter a core portion of an upper-end of the optical fiber preform 8, and propagate through the optical fiber 9 via the optical fiber preform 8. Since the optical fiber 9 is bent by the roller 920 disposed at the bottom of a drawing tower, the optical signals propagating therethrough partially leak through the side face of the optical fiber 9 at the bent portion. The leaking optical signals having the wavelengths ⁇ 1 and ⁇ 2 enter the phase detector unit 200 so that a phase difference therebetween is detected.
  • the chromatic dispersion of the optical fiber 9 between the bottom position of the optical fiber preform 8 where the optical fiber preform 8 is thinned to a predetermined fiber diameter, and the optical-signal emergent position (where the optical fiber 9 is brought into contact with the roller 920) can be measured, for example, by measuring the phase difference in the optical fiber preform 8 beforehand and then subtracting the detected phase difference from the phase difference determined by the method of this embodiment.
  • the drawing conditions are controlled by the control unit 940 on the basis of the obtained chromatic dispersion.
  • an optical fiber that provides a designed chromatic dispersion can be manufactured.
  • the chromatic-dispersion measuring apparatus 1 and the chromatic-dispersion measuring method of the first embodiment allow speedy measurement of chromatic dispersion even when the optical fiber to be measured is short, they are suitable for in-line measurement. Inputting optical signals having different wavelengths to the optical fiber to be measured from the upper end of the optical fiber preform enhances the input efficiency of the optical signals.
  • FIG. 3 is a schematic diagram showing a structure of a chromatic-dispersion measuring apparatus 2 of the second embodiment.
  • the chromatic-dispersion measuring apparatus 2 comprises a light source unit 300 and a phase detector unit 400, and serves to measure the chromatic dispersion of an optical fiber 9.
  • an optical amplifier 340 is placed subsequent to an intensity modulator 130.
  • the optical amplifier 340 optically amplifies light beams having the wavelengths ⁇ 1 and ⁇ 2 intensity-modulated by the intensity modulator 130, and outputs the optically amplified light beams as optical signals.
  • the optical signals with the wavelengths ⁇ 1 and ⁇ 2 output from the optical amplifier 340 enter simultaneously the optical fiber 9 to be measured.
  • bandpass filters 431 and 432 are disposed between photodetectors 221 and 222 and a phase detector 240.
  • the bandpass filters 431 and 432 receive the electrical signals output from the photodetectors 221 and 222, respectively, and selectively output a frequency component of the intensity modulation by the intensity modulator 130.
  • the phase detector 240 detects a phase difference between the electrical signals output from the bandpass filters 431 and 432, and thereby detects a phase difference between the optical signals with the wavelengths ⁇ 1 and ⁇ 2 .
  • Continuous light beams having the wavelengths ⁇ 1 and ⁇ 2 output from light sources 111 and 112 are multiplexed by a multiplexer 120, are subjected to intensity modulation by the intensity modulator 130 with a predetermined period, are optically amplified by the optical amplifier 340, and are then output as optical signals.
  • the optical signals with the wavelengths ⁇ 1 and ⁇ 2 output from the light source unit 300 enter the optical fiber 9, propagate therethrough, and enter the phase detector unit 400.
  • the optical signals having the wavelengths of ⁇ 1 and ⁇ 2 are de-multiplexed by a de-multiplexer 210.
  • the optical signal of ⁇ 1 is received by the photodetector 221, and the optical signal of ⁇ 2 is received by the photodetector 222.
  • An intensity-modulation frequency component of an electrical signal output from the photodetector 221 passes through the bandpass filter 431, and enters the photodetector 240.
  • An intensity-modulation frequency component of an electrical signal output from the photodetector 222 passes through the bandpass filter 432, and enters the phase detector 240.
  • the phase detector 240 detects a phase difference between the optical signals having the wavelengths ⁇ 1 and ⁇ 2 .
  • An arithmetical circuitry 250 calculates the chromatic dispersion of the optical fiber between the optical-signal incident position and the optical-signal emergent position on the basis of the detected phase difference.
  • the chromatic dispersion of the optical fiber 9 is also measured on the basis of the phase difference between the optical signals having the wavelengths ⁇ 1 and ⁇ 2 after the optical signals propagate through the optical fiber 9, it can quickly be measured even when the optical fiber 9 is short.
  • the light source unit 300 includes the optical amplifier 340 so as to increase the power of the optical signals output from the light source unit 300, this embodiment is suitable for use in a case in which the input efficiency of the optical signals to the optical fiber 9 is low or in a case in which the output efficiency of the optical signals from the optical fiber 9 is low.
  • the signal to noise ratio of the electrical signals can be increased, and high-precision phase difference measurement (that is, high-precision chromatic-dispersion measurement) is possible.
  • an optical fiber 9 (to be measured), which is obtained by drawing an optical fiber preform 8, is wound around a bobbin 930 via rollers 910 and 920.
  • the drawing conditions for example, the drawing speed, the optical-fiber-preform feeding speed, and the drawing-furnace temperature
  • a control unit 940 controls the drawing speed, the optical-fiber-preform feeding speed, and the drawing-furnace temperature.
  • Optical signals having the wavelengths ⁇ 1 and ⁇ 2 subjected to intensity modulation are output from the light source unit 300, enter the optical fiber 9 from the side face of a portion of the optical fiber 9 in contact with the roller 910, and propagate through the optical fiber 9. Since the optical fiber 9 is bent by the roller 920 disposed at the bottom of a drawing tower, the optical signals propagating through the optical fiber 9 partially leak from the side face at the bent portion. The leaking optical signals with the wavelengths ⁇ 1 and ⁇ 2 enter the phase detector unit 400 so that a phase difference therebetween is detected.
  • the chromatic dispersion of the optical fiber 9 between the optical-signal incident position (the position in contact with the roller 910) and the optical-signal emergent position (the position in contact with the roller 920) is determined on the basis of the detected phase difference.
  • the drawing conditions are controlled by the control unit 940 on the basis of the determined chromatic dispersion.
  • an optical fiber that provides a designed chromatic dispersion can be manufactured.
  • the chromatic-dispersion measuring apparatus 2 and the chromatic-dispersion measuring method of the second embodiment allow the chromatic dispersion to be measured quickly even when the optical fiber to be measured is short, they are suitable for in-line measurement.
  • the chromatic dispersion can be measured by in-line measurement even when the input efficiency of the optical signals is low, for example, when the optical signals enter the optical fiber 9 from the side face thereof. Further, since only the intensity-modulation frequency components are extracted by the bandpass filters 431 and 432, the signal to noise ratio of the electrical signals can be increased, and high-precision phase-difference measurement (that is, high-precision chromatic-dispersion measurement) is possible.
  • optical signals having different wavelengths are caused to enter into a side face of the optical fiber which is to be measured and the optical signals that emerge from a side face of the optical fiber are de-multiplexed and received, it is possible to measure the chromatic dispersion at a specific region in the longitudinal direction of the optical fiber.
  • the present invention is not limited to the above embodiments, and various modifications are possible.
  • more than three light sources which output light beams having different wavelengths respectively may be used.
  • the optical signals propagating through the optical fiber 9 may be output at the point where the drawing of the optical fiber starts.
  • the starting point of drawing of the optical fiber 9 is located at a given point on the bobbin 930. Therefore, optical signals emerging from the starting point of drawing of the optical fiber 9 that is rotating together with the bobbin 930 can be extracted via an optical rotary joint, for example.
  • the de-multiplexer and two photodetectors of the phase detector unit may be fixed to the bobbin 930, and electrical signals output from the photodetectors may be extracted via a slip ring and a graphite brush.
  • a radio transmitter as well as the de-multiplexer and the two photodetectors of the phase detector unit is fixed to the bobbin 930 and signals output from the photodetectors are converted into radio signals by the radio transmitter to be output by radio communication.
  • the arithmetical circuitry determines a cumulative chromatic dispersion DL(t) at a time "t", calculates a difference between the cumulative chromatic dispersion DL(t) and a cumulative chromatic dispersion DL(t- ⁇ t) at a time (t- ⁇ t) that is preceding the time t by a time ⁇ t, and determines a drawing length ⁇ L during the time ⁇ t.
  • the chromatic dispersion of the optical fiber 9 at each position can be obtained, and the distribution of chromatic dispersion in the longitudinal direction of the optical fiber 9 can be obtained.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Analytical Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Dispersion Chemistry (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Testing Of Optical Devices Or Fibers (AREA)
  • Spectrometry And Color Measurement (AREA)
EP02012377A 2001-06-08 2002-06-06 Appareil et procédé de mesure de la dispersion chromatique de fibres optiques Expired - Lifetime EP1265062B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2001174471A JP2002365165A (ja) 2001-06-08 2001-06-08 波長分散測定装置および方法
JP2001174471 2001-06-08

Publications (3)

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EP1265062A2 true EP1265062A2 (fr) 2002-12-11
EP1265062A3 EP1265062A3 (fr) 2004-02-11
EP1265062B1 EP1265062B1 (fr) 2012-06-20

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US (1) US7197242B2 (fr)
EP (1) EP1265062B1 (fr)
JP (1) JP2002365165A (fr)
DK (1) DK1265062T3 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1645861A1 (fr) * 2004-10-06 2006-04-12 Acterna Germany GmbH Dispositif et procédé de mesure de la dispersion chromatique d'une section de transmission optique
EP2410676A1 (fr) * 2010-07-19 2012-01-25 Intune Networks Limited Système de mesure de dispersion et procédé dans un réseau de communication optique
WO2014085574A3 (fr) * 2012-11-30 2014-07-31 Corning Incorporated Procédé de mesure de propriétés optiques de fibre multimode durant un traitement de la fibre
EP3185443A1 (fr) * 2015-12-23 2017-06-28 ADVA Optical Networking SE Système de télécommunications à multiplexage par répartition en longueur d'onde à compensation automatique de dispersion chromatique
JP2017142236A (ja) * 2016-01-18 2017-08-17 ドラカ・コムテツク・ベー・ベー マルチモードファイバＭＭＦ（ｍｕｌｔｉ−ｍｏｄｅ ｆｉｂｅｒ）又は少モードファイバＦＭＦ（ｆｅｗ−ｍｏｄｅ ｆｉｂｅｒ）の異モード遅延ＤＭＤ（Ｄｉｆｆｅｒｅｎｔｉａｌ Ｍｏｄｅ Ｄｅｌａｙ）に関連する時間遅延を測定する方法
US10122460B2 (en) 2017-01-13 2018-11-06 Adva Optical Networking Se Method and apparatus for automatic compensation of chromatic dispersion

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JP5398251B2 (ja) * 2008-06-18 2014-01-29 三菱電機株式会社 波長分散測定装置及び波長分散測定方法
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1645861A1 (fr) * 2004-10-06 2006-04-12 Acterna Germany GmbH Dispositif et procédé de mesure de la dispersion chromatique d'une section de transmission optique
EP2410676A1 (fr) * 2010-07-19 2012-01-25 Intune Networks Limited Système de mesure de dispersion et procédé dans un réseau de communication optique
WO2012010614A1 (fr) * 2010-07-19 2012-01-26 Intune Networks Limited Système et procédé de mesure de dispersion dans un réseau de communication optique
US8699875B2 (en) 2010-07-19 2014-04-15 Intune Networks Limited Dispersion measurement system and method in an optical communication network
WO2014085574A3 (fr) * 2012-11-30 2014-07-31 Corning Incorporated Procédé de mesure de propriétés optiques de fibre multimode durant un traitement de la fibre
US9279741B2 (en) 2012-11-30 2016-03-08 Corning Incorporated Method of measuring multi-mode fiber optical properties during processing of the fiber
EP3185443A1 (fr) * 2015-12-23 2017-06-28 ADVA Optical Networking SE Système de télécommunications à multiplexage par répartition en longueur d'onde à compensation automatique de dispersion chromatique
US10404397B2 (en) 2015-12-23 2019-09-03 Adva Optical Networking Se Wavelength division multiplexed telecommunication system with automatic compensation of chromatic dispersion
JP2017142236A (ja) * 2016-01-18 2017-08-17 ドラカ・コムテツク・ベー・ベー マルチモードファイバＭＭＦ（ｍｕｌｔｉ−ｍｏｄｅ ｆｉｂｅｒ）又は少モードファイバＦＭＦ（ｆｅｗ−ｍｏｄｅ ｆｉｂｅｒ）の異モード遅延ＤＭＤ（Ｄｉｆｆｅｒｅｎｔｉａｌ Ｍｏｄｅ Ｄｅｌａｙ）に関連する時間遅延を測定する方法
US10122460B2 (en) 2017-01-13 2018-11-06 Adva Optical Networking Se Method and apparatus for automatic compensation of chromatic dispersion

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EP1265062A3 (fr) 2004-02-11
EP1265062B1 (fr) 2012-06-20
US20020186437A1 (en) 2002-12-12
US7197242B2 (en) 2007-03-27
JP2002365165A (ja) 2002-12-18
DK1265062T3 (da) 2012-08-27

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